40639197 has 8 divisors (see below), whose sum is σ = 57373056. Its totient is φ = 25499072.

The previous prime is 40639189. The next prime is 40639199. The reversal of 40639197 is 79193604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40639197 - 2³ = 40639189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40639199) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398373 + ... + 398474.

It is an arithmetic number, because the mean of its divisors is an integer number (7171632).

Almost surely, 2^40639197 is an apocalyptic number.

It is an amenable number.

40639197 is a deficient number, since it is larger than the sum of its proper divisors (16733859).

40639197 is a wasteful number, since it uses less digits than its factorization.

40639197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796867.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 40639197 is about 6374.8879990161. The cubic root of 40639197 is about 343.8072569308.

The spelling of 40639197 in words is "forty million, six hundred thirty-nine thousand, one hundred ninety-seven".